<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>TAB样式</title>
</head>
<style type="text/css">
  #head{width:400px;
        height:30px;}
  #head ul{padding:0; margin:0;}
  #head ul li{ list-style:none; float:left; text-decoration:none; display:block; 
               width:80px;padding:5px; margin:0px 10px 0px 0px; position:relative;}
  #head ul li a{ text-decoration:none; color:#000000;}
  #head ul li a:visited{ text-decoration:none; color:#000000;}
  
 #L1{
 background-color:#9CC;
 border-top-color: #F6C;
 border-right-color: #F6C;
 border-left-color: #F6C;
  }
  #L2{
   background-color:#CC9;
   border-color:#309;
   margin-left:1px;
  }
 
 #L3{
   background-color:#FF3;
   border-color:#360;
  }
 #L4{
   background-color:#690;
   border-color:#360;
  } 
  
#d1{
 background-color:#9CC;
 border:1px solid #C39;
 width:400px;
  height:220px;
  margin-top:0px;
  position:absolute;
  z-index:1;
   
 }
#d2{
 background-color:#CC9;
 border:1px solid #309;
    display:none;
    width:400px;
    height:220px;
    margin-top:0px;
    position:absolute;
    z-index:1;
 }
#d3{
 background-color:#FF3;
 border:1px solid #360;
 display:none;
 width:400px;
  height:220px;
  margin-top:0px;
  position:absolute;
  z-index:1;
 }
 
#d4{
 background-color:#690;
 border:1px solid #360;
 display:none;
  width:400px;
  position:absolute;
  height:220px;
  margin-top:0px;
  z-index:1;
 }
</style>
<script language="javascript">
function Tab(num)
{
    var i;
    for(i=1;i<=4;i++)
    {
        if(i==num)
           document.getElementById("d"+i).style.display="block";
         else
           document.getElementById("d"+i).style.display="none";
    }
}
</script>
<body>
<div id="head">
<ul>
 <li id="L1" onclick="Tab(1)"><a href="#">公告信息</a></li>
 <li id="L2" onclick="Tab(2)"><a href="#">今日热点</a></li>
 <li id="L3" onclick="Tab(3)"><a href="#">最新新闻</a></li>
 <li id="L4" onclick="Tab(4)"><a href="#">考试信息</a></li>
</ul>
</div>

<div id="d1">
<ul>
  <li>这里是最新公告信息</li>
  <li>这里是最新公告信息</li>
  <li>这里是最新公告信息</li>
  <li>这里是最新公告信息</li>
</ul>
</div>
<div id="d2">
<ul>
  <li>这里是今日热点</li>
  <li>这里是今日热点</li>
  <li>这里是今日热点</li>
  <li>这里是今日热点</li>
</ul>
</div>
<div id="d3">
<ul>
  <li>这里是最新新闻</li>
  <li>这里是最新新闻</li>
  <li>这里是最新新闻</li>
  <li>这里是最新新闻</li>
</ul>
</div>
<div id="d4">
<ul>
  <li>这里是考试信息</li>
  <li>这里是考试信息</li>
  <li>这里是考试信息</li>
  <li>这里是考试信息</li>
</ul>
</div>
</body>
</html>